At least three Central Reserve Police Force (CRPF) troopers were killed and three injured Saturday in the third Maoist attack in Chhattisgarh in two days, police said.The attack site at Bhejji, about 500 km from Raipur, is in Dantewada district, Director General of Police (DGP) Vishwa Ranjan told IANS.A chopper that was sent from Dantewada town to the attack site airlifted the injured troopers to a government hospital at Jagdalpur town, headquarters of restive Bastar region. The injured soldiers have received bullet wounds in the legs. Maoists attacked the CRPF men when they were inspecting a jungle site for a base camp at Bhejji for a possible relocation as the Supreme Court has ordered security personnel to vacate school buildings, said Ranjan who is in Bastar region after a deadly attack on the police force Thursday midnight.The guerrillas decamped with weapons of the slain CRPF men and damaged approach roads to prevent reinforcements reaching the attack site. The police put the estimated number of the armed attackers at up to three dozen.Some rebels were also reported to have been either killed or injured in the retaliatory firing by the CRPF personnel. Maoists had carried out twin-attacks in the Bastar region Thursday. Five policemen were gunned down in Narayanpur district that morning. They struck again, killing 10 policemen around midnight in Dantewada district.Maoist attacks in Chhattisgarh have surged in the past weeks. The rebels killed nine policemen in an ambush May 23 along the Chhattisgarh-Orissa border in Raipur district.